Frozen Vegetable Minestrone Soup

Name: Frozen Vegetable Minestrone Soup
Ingredients: 1/4 cup extra-virgin olive oil; 1 cup frozen pearl onions, defrosted; 1/4 teaspoon red pepper flakes; 3 large cloves garlic, cut into rounds; 1 large Idaho potato, skin on, diced; Kosher salt; One 28-ounce can peeled whole tomatoes; One 15-ounce can great Northern or cannellini beans, drained and rinsed; Half of a 1-pound bag frozen peas, defrosted; Half of a 1-pound bag frozen corn, defrosted; 3 large stalks celery, peeled and thinly sliced; 1/2 cup pesto, for garnish; 1/2 cup freshly grated Parmesan, for garnish; Garlic bread, for serving, optional